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Sammanfattning

Agricultural intensification can affect biodiversity and related ecosystem services such as biological control, but large-scale experimental evidence is missing. We examined aphid pest populations in cereal fields under experimentally reduced densities of (1) ground-dwelling predators (-G), (2) vegetation-dwelling predators and parasitoids (-V), (3) a combination of (1) and (2) (-G-V),compared with open-fields (control), in contrasting landscapes with low vs. high levels of agricultural intensification (AI), and in five European regions. Aphid populations were 28%, 97%, and 199% higher in -G, -V, and -G -V treatments, respectively, compared to the open fields, indicating synergistic effects of both natural-enemy groups. Enhanced parasitoid : host and predator : prey ratios were related to reduced aphid population density and population growth. The relative importance of parasitoids and vegetation-dwelling predators greatly differed among European regions, and agricultural intensification affected biological control and aphid density only in some regions. This shows a changing role of species group identity in diverse enemy communities and a need to consider region-specific landscape management.

Nyckelord

agricultural intensification; cereal aphid; ecosystem service; European agricultural landscapes; functional group identity and diversity; landscape complexity; parasitoid; predator

Publicerad i

Ecological Applications
2011, volym: 21, nummer: 6, sidor: 2187-2196
Utgivare: ECOLOGICAL SOC AMER

SLU författare

UKÄ forskningsämne

Jordbruksvetenskap
Miljö- och naturvårdsvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1890/10-0929.1

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/58394